Mining-machine jack



Dec. 19, 1922. 1,439,677 M. P. HOLMES.

MINING MACHINE JACK.

FILED APR. 2. 1919.

Rig. 4.

110v 7710 his [021- y m w to engage with the coal.

Patented D... 19, 1922.

UNITED. STATES 1,439,677 PATENT OFFICE.

MORRIS P. HOLMES, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOB TO SULLIVANMACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

MINING-MACHIN E JACK.

Application filed April 2,

To all whom it may concern:

Be it known that I, MORRIS P. HOLMES, a citizen of the United States,residing at Claremont, in the county of Sullivan and State of NewHampshire, have invented certain new and useful Improvements inMining-Machine Jacks, of which the following is a full, clear, and exactspecification.

y invention relates to mining machine jacks.

It has for its object to'provide an improved jack adapted to form asturdy connection and to be readily removed when desired. A furtherobject of my invention is to provide an im roved jack having thecharacteristics mentioned above and referably also adapted to use as abar, W ich is of simple yet rugged construction and adapted to bemanufactured at small expence.

In the accompanying drawings, I have shown two embodiments which myinvention may assume in practice.

In these drawings,-

Fig. 1 is a side elevation of my improved jack in operative position.

Fig. 2 is a rear view of the same.

Fig. 3 is a side elevation of the same when in break-down position.

Fig. 4 is a side elevation of a modified form of jack adapted also touse as a bar.

In this illustrative construction, it will be observed that I have showna jack including a main body portion 1 forming substantially the entirelength of the jack and having a point or end member 2 on one end adaptedAs shown, this body portion 1 is provided with a longitudinal slot 3 inits lower end and has pivotally connected thereto at the lower end ofthis slot 3, as on a suitable transverse pivot member 4 formed in alateral extension 5,

an extension or foot-piece 6. This member 6 has, as shown, a point 7 onits lower end and at one side of and substantially beneath the pivot,and an extension 8 on its upper end and above the pivot. As shown, thisextension 8 is elongated and adapted in one 1gosition to occupy theposition shown in ig. 3, wherein it is disposed at an angle to the slotin the member 1, or in another position to occupy the position showninFig. 1, wherein it is received in the slot 3 and engages the bottomthereof. It will also be observed that operatively connected to the1919. Serial No. 287,025.

pivot member 4, I preferably also provide a draft connection, hereinin..the form of a hook 9 adapted to receive the end of a feed member,such for example as a mining machine feed chain 10.

In the use of my improved construction, the jack is first set,preferably as shown in Fig. 3, with the two points 2 and 7 engaging thecoal. The chain 10 is then connected to the hook 9. As a result, whenthe chain is placed under tension, the same acts automatically to movethe parts of the jack from the position shown in Fig. 3 to the positionshown in Fig. 1, wherein the extension 8 is seated in the slot 3 and,through its pressure gainst the'bottom of the slot, forms a rigidutment, the ends of which are adapted to ecome more deeply embedded inthe coal as the pull on the chain 10 increases. Obviously, however, whenthe tension on the chain 10 is released, all that it is necessary to dois to kick in the pivot of the same, whereupon the jack is broken,position shown in Fig. 3, so that the operator, upon grasping the jack,may readily lower i assuming the In Fig. 4, I have illustrated amodified form of this construction, wherein in addirendered rigidthroughout its length in such a manner as to'adapt it to be used as abar.

It will also be observed that in this form of my invention a lateralextension 13 is also provided on the lower end of the member 1 tofacilitate the barring o erations. Thus, it will be observed that whi ethe form of my invention shown in this figure is adapted to use in thesame relations as the form shown in Figs 1 to 3, it is also adapted tobe used at will either as a rigid jack or a rigid bar.

In my improved construction, it will be observed that due to thecooperation of the extension 8 on the foot-piece with the body portion 1of the jack, great strength is obtained, the foot-piece and body portionthereby forming a substantially unitary construction during use. Due tothe provision of the pivot 4 on the lateral extension 5, .it

will also be observed that the pivot is disposed at one side of the lineconnecting the extremities of the points 2 and 7, so that when tensionupon the draft connection is relieved. the same will remain firmlyembedded in the coal until intentionally released by kicking in thepivot. Attention is also directed to the fact that the constructionshown is exceedingly simple and rugged and adapted to bemanufactured atsmall expense. These and other advantages of my improved constructionwill, however. be clearly apparent to those skilled in the art.

'hile I have in this application specifically described two embodimentswhich my invention may assume in practice, it is to be nnderstood thatthese forms are shown for illustrative purposes only and that theinvention may be further modified and embodied in various other formswithout departing from its spirit or the scope of the appended claimshat I claim as new and desire to secure by Letters Patent is:

1. A mining machine jack having a lateral draft connection andcomprising an elongated body member. and an extension thereof pivotallyconnected between its ends to said member.

2. A mining machine jack having a lateral draft connection and includingan elongated body member, and a foot-piece pivotally connected betweenits ends to one end thereof.

A mining machine jack comprising a body member. a pivotally mounted footpiece disposed parallel therewith. and a draft connection on the pivotthereof.

4. A mining machine jack having a lateral draft connection andcomprising an elongated body member, and a pivoted footpiece. oneengaging the other at one side of the pivot.

5. A mining machine jack having a lat eral draft connection andincluding an elongated body member. and a foot-piece pivotally connectedbetween its ends to one end thereof and having a member engagabletherewith.

6. A mining machine jack having :1 lat eral draft connection andincluding an elongated body member. and a foot-piece pivotallv connectedbetween its ends to one end thereof on a laterally offset pivot.

'i'. A mining machine jack including an elongated body member. afoot-piece piw otally connected between its ends to one end thereof. anda draft connection adjacent said pivotal connection.

8. A mining machine jack having a lateral draft connection andcomprising an elongated body portion having a slotted endQand afoot-piece pivoted at a point intermediate its ends to one end thereofand having a member receivable in the slot therein.

9. A mining machine jack having a lateral draft connection andcomprising pivotally connected interengaging end portions pivotallyconnected at one side of a line between their free extremities.

10. A mining machine jack comprising pivotally connected interengagingend por tions pivotally connected at one side of a line between theirfree extremities, and a draft connection on said pivot.

11. A mining machine jack comprising pivotally connected end portionsengagable at one side of their pivot. and a draft connection operativelyconnected to the pivot.

12. A mining machine jack having a lateral draft connection andcomprising pivotally connected and interengaging members adapted to forma rigid structure when subject to tension and to maintain the same aftertension is removed.

13. A mining machine jack having a lateral draft connection andcomprising an elongated body portion, a foot-piece pivotally connectedat a point intermediate its ends to one end thereof. and means forrigidly connecting said elements.

14. A mining machine jack having a lateral draft connection andcomprising an elongated body portion, a footpiece pivotally connected ata point intermediate its ends to one end thereof. and a reciprocableclamping collar for rigidly connecting said elements.

.15. A mining machine jack comprising an elongated body portion having aslotted end. a foot-piece pivoted at a point intermediate its ends toone end thereof and having a member receivable in the slot therein. anda draft connection connected adjacent the pivot point.

16. A mining machine jack comprising an elongated body member having alateral extension on one of its ends. a foot-piece pivotally mounted ata point intermediate its ends adjacent said extension, a draftconnection operable upon said pivotal connection, and means for rigidlyconnecting said body member and foot-piece.

17. In a mining machine jack. a pair of pivotally connectedinterengaging end portions pivotally connected at a point which isdisposed at one side of a line connecting their free ends prior toplacing said jack in operative position. anr disposed at the oppositeside of such a line when said jack is loaded. and a draft connectionadjacent said pivot.

In testimony whereof I aflix my signature.

MORRIS P. HOLMES.

